Methods of plotting advanced logging information

Abstract

An embodiment of an apparatus for estimating and displaying formation and formation fluid properties includes a sampling device coupled to borehole fluid, the borehole fluid including hydrocarbons released from a region of the formation surrounding an interval of the borehole. The apparatus also includes an analysis unit configured to analyze the sample of the borehole fluid at each of a plurality of sample times and estimate amounts of hydrocarbons in the borehole fluid, and a processing device configured to estimate one or more ratios of an amount of at least one hydrocarbon gas to an amount of at least another hydrocarbon gas at each sample time, analyze the one or more ratios to estimate a type of hydrocarbon fluid associated with the ratio, and automatically generate a fluid log that displays an indication of the type at each of the plurality of sample times.

The invention claimed is: 
     
       1. An apparatus for estimating and displaying formation and formation fluid properties, comprising:
 a sampling device coupled to borehole fluid circulated through a borehole in an earth formation, the borehole fluid including hydrocarbons released from a region of the formation surrounding an interval of the borehole, the sampling device configured to sample the borehole fluid at a plurality of sample times during a downhole operation; 
 an analysis unit configured to analyze the sample of the borehole fluid at each sample time and estimate amounts of hydrocarbons in the borehole fluid; and 
 a processing device configured to estimate one or more ratios of an amount of at least one hydrocarbon gas to an amount of at least another hydrocarbon gas at each sample time, analyze the one or more ratios to estimate a type of hydrocarbon fluid associated with the ratio, and automatically generate a fluid log that displays an indication of the type at each of the plurality of sample times. 
 
     
     
       2. The apparatus of  claim 1 , wherein the one or more ratios include a ratio of an amount of a light hydrocarbon to an amount of one or more heavier hydrocarbons. 
     
     
       3. The apparatus of  claim 1 , wherein the hydrocarbons are released from the region of the formation as a result of drilling the borehole. 
     
     
       4. The apparatus of  claim 1 , wherein the processing device is configured to correlate values of the one or more ratios to a fluid type, and display an indicator of at least one of the values and the fluid type in the fluid log. 
     
     
       5. The apparatus of  claim 1 , wherein the processing device is configured to calculate a permeability index based on the one or more ratios. 
     
     
       6. The apparatus of  claim 5 , wherein the permeability index is calculated based on a slope of a trace formed by plotting the values of multiple gas ratios for a borehole interval. 
     
     
       7. The apparatus of  claim 5 , wherein the processing device is configured to estimate traces on a triangular plot of multiple gas ratios, and calculate the permeability index based on a point of intersection between the traces. 
     
     
       8. The apparatus of  claim 5 , wherein the processing device is configured to estimate a plurality of gas ratios, each gas ratio being a ratio of one hydrocarbon gas type to total gas, plot each gas ratio on a triangular plot, and estimate whether the interval represents a permeable heavier hydrocarbon zone or a permeable lighter hydrocarbon zone. 
     
     
       9. The apparatus of  claim 5 , wherein the permeability index is calculated based on a value of a Haworth ratio of hydrocarbon gases. 
     
     
       10. The apparatus of  claim 5 , wherein the permeability index is calculated based on a value of an oil indicator, the oil indicator calculated based on a ratio of a sum of multiple heavy hydrocarbon components to a light hydrocarbon component. 
     
     
       11. A method of estimating and displaying formation and formation fluid properties, comprising:
 sampling a borehole fluid circulated through a borehole in an earth formation at a plurality of sample times during a downhole operation, the borehole fluid including hydrocarbons released from a region of the formation surrounding an interval of the borehole; 
 analyzing, by an analysis unit, the sample of the borehole fluid at each sample time and estimating amounts of hydrocarbons in the borehole fluid; 
 estimating, by a processing device, one or more ratios of an amount of at least one hydrocarbon gas to an amount of at least another hydrocarbon gas at each sample time, and analyzing the one or more ratios to estimate a type of hydrocarbon fluid associated with the ratio; 
 automatically generating a fluid log that displays an indication of the type at each of the plurality of sample times; and 
 performing aspects of the energy industry operation based on the fluid log. 
 
     
     
       12. The method of  claim 11 , wherein the one or more ratios include a ratio of an amount of a light hydrocarbon to an amount of one or more heavier hydrocarbons. 
     
     
       13. The method of  claim 11 , wherein the hydrocarbons are released from the region of the formation as a result of drilling the borehole. 
     
     
       14. The method of  claim 11 , wherein generating the fluid log includes correlating values of the one or more ratios to a fluid type, and displaying an indicator of at least one of the values and the fluid type in the fluid log. 
     
     
       15. The method of  claim 11 , wherein analyzing includes calculating a permeability index based on the one or more ratios. 
     
     
       16. The method of  claim 15 , wherein the permeability index is calculated based on a slope of a trace formed by plotting the values of multiple gas ratios for a borehole interval. 
     
     
       17. The method of  claim 15 , wherein analyzing includes estimating traces on a triangular plot of multiple gas ratios, and calculating the permeability index based on a point of intersection between the traces. 
     
     
       18. The method of  claim 15 , wherein analyzing includes estimating a plurality of gas ratios, each gas ratio being a ratio of one hydrocarbon gas type to total gas, plotting each gas ratio on a triangular plot, and estimating whether the interval represents a permeable heavier hydrocarbon zone or a permeable lighter hydrocarbon zone. 
     
     
       19. The method of  claim 15 , wherein the permeability index is calculated based on a value of a Haworth ratio of hydrocarbon gases. 
     
     
       20. The method of  claim 15 , wherein the permeability index is calculated based on a value of an oil indicator, the oil indicator calculated based on a ratio of a sum of multiple heavy hydrocarbon components to a light hydrocarbon component.